JP4314345B2 - Dolly with stairs lifting function - Google Patents

Description

  The present invention relates to a cart with a stair lift function that loads a load and moves up and down a stair.

  For example, as shown in FIG. 5, a conventional cart with a stair lifting / lowering function has a structure in which a crawler 2 and an auxiliary leg 3 are attached to a main body frame 1, especially when transporting luggage 4 up and down. When the lift operation is performed by using the trolley, the cart loaded with the load 4 is inclined using the crawler driven by the electric motor equipped with the storage battery as the contact point at the end of the tread of the stairs.

Numerous carts that can run on stairs using a crawler are commercially available, and the typical example is the “battery-type electric carp” released by Sanwa. A cart is also known in which a pair of left and right rotating plates are provided at both ends of the drive shaft instead of the crawler, and a plurality of concentric drive wheels are provided on the rotating plate around the drive shaft (for example, patents). Reference 1).
JP 2001-287653 A

  In the conventional cart with a stair lift function shown in FIG. 5, since the auxiliary leg 3 is arranged near the crawler 2, when the vertical heavy object having a high center of gravity is loaded and inclined, The center of gravity of the mold heavy object falls over at an angle that goes out of the landing part of the roller at the tip of the auxiliary leg 3. Further, the angle adjustment of the auxiliary leg 3 is a structure in which a pin is engaged with a plurality of position selection holes provided in the main body frame 1 and holes provided in the auxiliary leg 3, so that the center of gravity of the auxiliary leg 3 is In order to change the angle before going out, it is necessary to manually support the load of the cart and the loaded luggage 4 and re-engage the pins. Also in the cart described in Patent Document 1, the angle adjustment method of the auxiliary leg is the same, and the pin is engaged with the hole provided in the auxiliary leg and the hole provided in the main body frame. There is.

  In addition, in the case of the conventional trolley with the function of raising and lowering the staircase shown in FIG. 5, when trying to carry the stairs by loading a heavy object with a high center of gravity, the center of gravity of the entire carriage loaded with the heavy object is the landing point of the crawler 2. There is a problem that it falls when it goes up.

  Furthermore, in the example of the carriage described in Patent Document 1, there is no fear of falling when the stairs are raised or lowered, but since there is no turning function when running on flat ground, the auxiliary leg is manually turned when turning the carriage on the flat ground. It is necessary to swivel while sliding.

  Therefore, the present invention provides a cart with a stair lift function that can change the angle of the auxiliary leg without requiring human power, has a low risk of falling when the stair lifts, and can smoothly travel on the ground and the stairs. The purpose is to do.

In order to achieve the above object, a cart with a stair lifting / lowering function according to claim 1 of the present invention includes a main body frame for loading a load, and a drive device attached to the rear side of the main body frame and provided on the main body frame. A pair of left and right crawlers that rotate by the driving force of the left and right, and left and right that are attached to the central portion of the main body frame and rotated and fixed at an arbitrary angle by the driving force of the driving device or another driving device provided on the main body frame It is set as the structure provided with a pair of auxiliary leg and the stair-climbing auxiliary tool attached to the said auxiliary leg at the time of stair-climbing.
According to a second aspect of the present invention, a plurality of universal casters are provided at the tip of the auxiliary leg.
According to a third aspect of the present invention, the stair lift support tool is a crawler.

  According to the present invention, there is provided a cart with a stair lift function that can change the angle of the auxiliary leg without requiring human power, has a low risk of falling during the stair lift, and can smoothly travel on flat ground and stairs. can do.

  Embodiments of a cart with a stair lift function according to the present invention will be described below with reference to the drawings.

Fig.1 (a) is a side view of the trolley | bogie with a staircase raising / lowering function of a present Example, (b) and (c) are the partial detail drawings of (a).
A pallet 5 on which the load 4 is loaded is fixed to the main body frame 1 by welding. The main body frame 1 uses a square steel pipe in order to reduce the mass of the carriage. When it is necessary to move the pallet 5 up and down along the main body frame 1, the main body frame 1 within the range in which the pallet 5 moves is formed of grooved steel with a lip, and a plurality of rollers are freely provided at both left and right ends of the pallet 5. Mounted so that it can rotate, and assembles the groove part of the lip-shaped grooved steel of the main body frame 1 so that the roller runs, attaches a nut to the center of the pallet 5, attaches a screw to the main body frame 1, passes the screw through the nut, A screw rotating motor is attached to the end of the screw, and the nut and the pallet 5 integrated with the nut are moved up and down by the rotational force of the motor.

  The crawler 2 is provided in a pair of left and right on the rear side of the main body frame 1 and is configured by winding a crest belt 2a around a crawler driving pulley 2b. The left and right crawler driving pulleys 2b are connected to a motor shaft and rotated by the driving force of the motor.

  A pair of left and right auxiliary legs 3 are attached near the center of the main body frame 1, and a rotatable dual caster 6 is provided on the landing portion. The double caster 6 is provided with a mounting plate 8a for mounting the auxiliary leg crawler 7 shown in FIG. The left and right auxiliary legs 3 are connected by a rotation shaft 9 so that the left and right auxiliary legs 3 always rotate in the same phase. Further, when the tip of the auxiliary leg is hung on the floor when the stairs are raised and lowered, the auxiliary leg 3 is curved at an appropriate clearance angle so as not to interfere with the top of the staircase. The rotation shaft 9 is attached via a bearing so as to be rotatable with respect to the main body frame 1.

  The auxiliary leg 3 is driven by a double-acting hydraulic cylinder 10. One end of the hydraulic cylinder 10 is connected to the main body frame 1 by a rotatable lower pin 11 provided with a mounting seat, and the other end is connected to the auxiliary leg 3 by a rotatable upper pin 12. Further, on the outside of the crawler driving pulley 2b, a rotatable flat ground running roller 13 that is not connected to a motor shaft that drives the crawler driving pulley 2b is provided.

FIG. 2A is a side view of the auxiliary leg crawler 7, and FIG. 2B is a top view.
The auxiliary leg crawler 7 has two belts 16 that are wound around three pulleys 18a, 18b, and 18c to form a track. The three pulleys 18a, 18b, and 18c are arranged in a triangular shape, and are attached to the base plate 17 via bearings 19a, 19b, and 19c so as to be freely rotatable. In order to prevent 16 track deviations, a belt guide is provided. The base plate 17 is provided with a rib for improving the strength and an attachment plate 8b for coupling the auxiliary leg 3 and the auxiliary leg crawler 7 together. Furthermore, the base plate 17 is also provided with a tension adjusting mechanism 20 that adjusts the tension of the belt.

The operation of the cart with the stair lifting / lowering function of this embodiment having the above-described configuration will be described below.
Fig.3 (a) is the state at the time of flat ground driving | running | working of the trolley | bogie with a stair-climbing function. When traveling on flat ground, it is supported by a pair of left and right flat ground traveling rollers 13 and a duplex caster 6 at the tip of a pair of left and right auxiliary legs 3, and these six rollers move by human power.

  FIG.3 (b) is a figure which shows the state of the trolley | bogie with a stair-lifting function at the time of passing through the place where a height restriction | limiting is carried out at the time of flat ground driving. When passing the place where the height of the carriage is restricted, the hydraulic cylinder 10 is operated in the direction of contraction, the auxiliary leg 3 is opened forward, and the carriage is lowered. Even at this time, since the auxiliary leg 3 and the double caster 6 are connected by the rotatable pin 6a, the double caster 6 can always turn horizontally and rotate freely and stably run.

  As shown in FIG. 3C, when the stairs are raised and lowered, the auxiliary leg crawler 7 is attached to the dual caster 6 at the tip of the auxiliary leg 3, and the stairs are raised and lowered by the flat land running roller 13, the crawler 2 and the auxiliary leg crawler 7. To do.

FIG. 4 is a diagram for explaining the stair ascending / descending operation.
At the time of ascending and descending the stairs, the auxiliary leg crawler 7 is placed in front of the stairs 22, and the carriage is moved toward the auxiliary leg crawler 7 in the state where the hydraulic cylinder 10 is operated to extend to raise the carriage (a). After the auxiliary leg 3 rides on the base plate 17 of the auxiliary leg crawler 7, the mounting plate 8a provided on the duplex caster 6 and the mounting plate 8b provided on the auxiliary leg crawler 7 are bolted (b). Next, when the rotation of the flat land running roller 13 is restrained and the hydraulic cylinder 10 is operated in a contracting direction, the auxiliary leg crawler 7 starts to rise up the stairs 22 (c). When the hydraulic cylinder 10 is further operated in the contracting direction, the auxiliary leg 3 operates to open forward, and the auxiliary leg crawler 7 rides on the stairs 22 (d). When the inclination of the carriage is less than about 60 degrees, the crested belt 2a of the crawler 2 reaches the flat ground 21. Therefore, the crawler 2 can move forward when the inclination of the carriage is about 60 degrees or less. In this state, the crawler 2 is moved forward while restraining the rotation of the flat land traveling roller 13 of the carriage (e). After the crawler 2 moves forward until it hits the staircase 22, the hydraulic cylinder 10 is further moved in a contracting direction, and the crawler 2 is moved forward to move up the staircase 22 (f).

  According to the cart with the stair climbing function of the present embodiment, the setting and changing of the angle of the auxiliary leg 3 can be performed without depending on human power. Moreover, even if the angle of the carriage changes, it is possible to ensure stable flat ground running performance and to move up and down the stairs without using an auxiliary tool such as a slope.

BRIEF DESCRIPTION OF THE DRAWINGS The trolley | bogie with a stair-lifting function of the Example of this invention is shown, (a) is a side view of the whole, (b) and (c) are detailed drawings of b part and c part of (a). The auxiliary | assistant leg crawler attached to the trolley | bogie with a stair-lifting function of the Example of this invention is shown, (a) is a side view, (b) is a top view. The figure which shows the driving | running | working state of the trolley | bogie with a stair-lifting function of the Example of this invention. The figure explaining the operation | movement which goes up the stairs of the trolley | bogie with a stairs raising / lowering function of the Example of this invention. The figure which shows the conventional trolley | bogie with a stair-lifting function.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Body frame, 2 ... Crawler, 2a ... Belt with crest, 2b ... Pulley for driving crawler, 3 ... Auxiliary leg, 4 ... Luggage, 5 ... Pallet, 6 ... Dual caster, 6a ... Pin, 7 ... Auxiliary leg Crawler, 8a, 8b ... Mounting plate, 9 ... Rotating shaft, 10 ... Hydraulic cylinder, 11 ... Lower pin, 12 ... Upper pin, 13 ... Flat roller, 16 ... Belt, 17 ... Base plate, 17a ... Rib, 18a, 18b, 18c ... pulley, 19a, 19b, 19c ... bearing, 20 ... tension adjusting mechanism, 21 ... flat ground, 22 ... staircase.

Claims (3)

  A main body frame for loading a load, a pair of left and right crawlers attached to the rear side of the main body frame and rotated by a driving force of a driving device provided on the main body frame, and the driving device attached to a central portion of the main body frame Alternatively, it includes a pair of left and right auxiliary legs that are rotated and fixed at an arbitrary angle by a driving force of another driving device provided in the main body frame, and a stair lift support tool that is attached to the auxiliary legs when the stair is lifted A trolley with a stair lift function.   The trolley with a stair lift function according to claim 1, further comprising a plurality of free casters at the tip of the auxiliary leg. The cart with a stair lift function according to claim 1, wherein the stair lift support tool is a crawler.

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